/*
* Apply relocations to the values we got from the file. `relbase' is the
* target relocation address of the section, and `dataoff' is the target
* relocation address of the data in `dest'.
*/
int
ef_reloc(struct elf_file *ef, const void *reldata, int reltype, Elf_Off relbase,
Elf_Off dataoff, size_t len, void *_dest)
{
Elf_Addr *where, addr, addend;
Elf_Size rtype, symidx;
const Elf_Rel *rel;
const Elf_Rela *rela;
char *dest = _dest;
switch (reltype) {
case EF_RELOC_REL:
rel = (const Elf_Rel *)reldata;
where = (Elf_Addr *)(dest + relbase + rel->r_offset - dataoff);
addend = 0;
rtype = ELF_R_TYPE(rel->r_info);
symidx = ELF_R_SYM(rel->r_info);
break;
case EF_RELOC_RELA:
rela = (const Elf_Rela *)reldata;
where = (Elf_Addr *)(dest + relbase + rela->r_offset - dataoff);
addend = rela->r_addend;
rtype = ELF_R_TYPE(rela->r_info);
symidx = ELF_R_SYM(rela->r_info);
break;
default:
return (EINVAL);
}
if ((char *)where < (char *)dest || (char *)where >= (char *)dest + len)
return (0);
if (reltype == EF_RELOC_REL)
addend = *where;
switch (rtype) {
case R_386_RELATIVE: /* A + B */
addr = (Elf_Addr)addend + relbase;
*where = addr;
break;
case R_386_32: /* S + A - P */
addr = EF_SYMADDR(ef, symidx);
addr += addend;
*where = addr;
break;
case R_386_GLOB_DAT: /* S */
addr = EF_SYMADDR(ef, symidx);
*where = addr;
break;
default:
warnx("unhandled relocation type %d", (int)rtype);
}
return (0);
}
/*
* Apply relocations to the values we got from the file. `relbase' is the
* target relocation address of the section, and `dataoff' is the target
* relocation address of the data in `dest'.
*/
int
ef_reloc(struct elf_file *ef, const void *reldata, int reltype, Elf_Off relbase,
Elf_Off dataoff, size_t len, void *dest)
{
Elf64_Addr *where, val;
Elf32_Addr *where32, val32;
Elf_Addr addend, addr;
Elf_Size rtype, symidx;
const Elf_Rel *rel;
const Elf_Rela *rela;
switch (reltype) {
case EF_RELOC_REL:
rel = (const Elf_Rel *)reldata;
where = (Elf_Addr *)(dest + relbase + rel->r_offset - dataoff);
addend = 0;
rtype = ELF_R_TYPE(rel->r_info);
symidx = ELF_R_SYM(rel->r_info);
break;
case EF_RELOC_RELA:
rela = (const Elf_Rela *)reldata;
where = (Elf_Addr *)(dest + relbase + rela->r_offset - dataoff);
addend = rela->r_addend;
rtype = ELF_R_TYPE(rela->r_info);
symidx = ELF_R_SYM(rela->r_info);
break;
default:
return (EINVAL);
}
if ((char *)where < (char *)dest || (char *)where >= (char *)dest + len)
return (0);
if (reltype == EF_RELOC_REL) {
/* Addend is 32 bit on 32 bit relocs */
switch (rtype) {
case R_X86_64_PC32:
case R_X86_64_32S:
addend = *(Elf32_Addr *)where;
break;
default:
addend = *where;
break;
}
}
switch (rtype) {
case R_X86_64_NONE: /* none */
break;
case R_X86_64_64: /* S + A */
addr = EF_SYMADDR(ef, symidx);
val = addr + addend;
*where = val;
break;
case R_X86_64_32S: /* S + A sign extend */
addr = EF_SYMADDR(ef, symidx);
val32 = (Elf32_Addr)(addr + addend);
where32 = (Elf32_Addr *)where;
*where32 = val32;
break;
case R_X86_64_GLOB_DAT: /* S */
addr = EF_SYMADDR(ef, symidx);
*where = addr;
break;
case R_X86_64_RELATIVE: /* B + A */
addr = (Elf_Addr)addend + relbase;
val = addr;
*where = val;
break;
default:
warnx("unhandled relocation type %d", (int)rtype);
}
return (0);
}
